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authorUlf Hansson <ulf.hansson@linaro.org>2017-02-17 10:55:25 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-02-23 22:25:46 +0100
commit2da835452a0875866ca55d23126c77b9372f0015 (patch)
treeed9bc9cad8e875f3ffb7aba39a6510b7a09868b9 /drivers/base
parent3c64649d1cf9f32fd16491e69ccc16385e0ef421 (diff)
PM / Domains: Power off masters immediately in the power off sequence
Once a subdomain is powered off, genpd queues a power off work for each of the subdomain's corresponding masters, thus postponing the masters to be powered off to a later point. When genpd used intermediate power off states, which was removed in commit ba2bbfbf6307 ("PM / Domains: Remove intermediate states from the power off sequence"), this behaviour made sense, but now it simply doesn't. Genpd can easily try to power off the masters in the same context as the subdomain, of course by acquiring/releasing the lock. Then, let's convert to this behaviour, as it avoids unnecessary works from being queued. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/domain.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 179bb269a58f..e697dec9d25b 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -284,7 +284,8 @@ static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
* If all of the @genpd's devices have been suspended and all of its subdomains
* have been powered down, remove power from @genpd.
*/
-static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on)
+static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
+ unsigned int depth)
{
struct pm_domain_data *pdd;
struct gpd_link *link;
@@ -351,7 +352,9 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on)
list_for_each_entry(link, &genpd->slave_links, slave_node) {
genpd_sd_counter_dec(link->master);
- genpd_queue_power_off_work(link->master);
+ genpd_lock_nested(link->master, depth + 1);
+ genpd_power_off(link->master, false, depth + 1);
+ genpd_unlock(link->master);
}
return 0;
@@ -405,7 +408,9 @@ static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth)
&genpd->slave_links,
slave_node) {
genpd_sd_counter_dec(link->master);
- genpd_queue_power_off_work(link->master);
+ genpd_lock_nested(link->master, depth + 1);
+ genpd_power_off(link->master, false, depth + 1);
+ genpd_unlock(link->master);
}
return ret;
@@ -462,7 +467,7 @@ static void genpd_power_off_work_fn(struct work_struct *work)
genpd = container_of(work, struct generic_pm_domain, power_off_work);
genpd_lock(genpd);
- genpd_power_off(genpd, false);
+ genpd_power_off(genpd, false, 0);
genpd_unlock(genpd);
}
@@ -581,7 +586,7 @@ static int genpd_runtime_suspend(struct device *dev)
return 0;
genpd_lock(genpd);
- genpd_power_off(genpd, true);
+ genpd_power_off(genpd, true, 0);
genpd_unlock(genpd);
return 0;
@@ -661,7 +666,7 @@ err_poweroff:
if (!pm_runtime_is_irq_safe(dev) ||
(pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) {
genpd_lock(genpd);
- genpd_power_off(genpd, true);
+ genpd_power_off(genpd, true, 0);
genpd_unlock(genpd);
}